ögrammer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that a new operating system. How many computers must be surveyed in order to be 90% confident that his estimate is in error by no more than four percentage ats? Complete parts (a) through (c) below. ssume that nothing is known about the percentage of computers with new operating systems. und up to the nearest integer.) Assume that a recent survey suggests that about 85% of computers use a new operating system. und up to the nearest integer.) Does the additional survey information from part (b) have much of an effect on the sample size that is required? A. No, using the additional survey information from part (b) only slightly increases the sample size. B. No, using the additional survey information from part (b) does not change the sample size. C. Yes, using the additional survey information from part (b) dramatically reduces the sample size. D. Yes, using the additional survey information from part (b) dramatically increases the sample size.

NO An online test of English spelling looked at how well people spelled difficult words. The bar graph to the right shows how many people per 100 spelled each word correctly. a. Estimate the number of people per 100 who spelled weird correctly. Round to the nearest 5. b. In a group consisting of 8721 randomly selected people, estimate how many more people can correctly spell weird than inoculate. Number of People per 100 Spelling Various Words Correctly weird N cemetery accommodation harass supersede inoculate F 0 a. The approximate number of people per 100 who spelled weird correctly is (Type a whole number.) 10 20 40 60 80 100 Number of people (per 100) Q Q G

Q7

88 students at a college were asked whether they had completed their required English 101 course, and 58 students said "yes". Find the best point estimate for the proportion of students at the college who have completed their required English 101 course. Round to four decimal places.

please solve

Some states now allow online gambling. As a marketing manager for a casino, you need to determine the percentage of adults in those states who gamble online. How many adults must you survey in order to be 90% confident that your estimate is in error by no more than one percentage point? Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of adults who gamble online. n=0 (Round up to the nearest integer.) b. Assume that 18% of all adults gamble online. n= (Round up to the nearest integer.)

94 students at a college were asked whether they had completed their required English 101 course, and 73 students said "yes". Find the best point estimate for the proportion of students at the college who have completed their required English 101 course. Round to four decimal places.

A polling company reported that 19% of 1018 surveyed adults said that secondhand smoke is "very harmful." Complete parts (a) through (d) below. a. What is the exact value that is 19% of 1018? The exact value is 193.4 (Type an integer or a decimal.)

135 students at a college were asked whether they had completed their required English 101 course, and 80 students said "yes". Find the best point estimate for the proportion of students at the college who have completed their required English 101 course. Round to four decimal places.